Yong-le: Year 13, Month 5, Day 6
12 Jun 1415
In Jiao-zhi, the following offices were established: 1. A commercial tax bureau in San River Prefecture. 2. Five commercial tax offices in the two subprefectures of Tuo River and Dong-chao and the three counties of Qing-bo, Ma-qi and Xia-hua. 3. The Guang-ji Store in Tai-yuan Prefecture. 4. Three police offices at Jing-hao River in Li-ren County, Tong-guang in Shang Si-lang Subprefecture and at Yang Inn Hamlet at the Si-gang (Alt: Tong-gang) River-port in Xin-hua County.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 13, page 1849